Portable sectional hoist



Oct. 21, 1958 e. F. KINSMAN PORTABLE SECTIONAL HOIST Filed Sept. 22, 1955 3 Sheets-Sheet 1' INVENTOR. G FRANK K/NSMAN' Oct. 21, 1958 G. F. KINSMAN 2,357,021

PORTABLESECTIONAL HOIST Filed Sept. 22. 1955 1 5 Sheets-Sheet 2 w INVENTOR.

E FRANK KINSMAN 21, 1958 G. F; KINSMAN v 2,857,021

PQRTABLE SECTIONAL HOIST 3 Sfieets-Sheet 3 Filed Sept. 22, 1955 INVENTOR. a. FRANK m/vgm m United States Patent PGRTABLE SECTIONAL HOIST George Frank Kinsman, Stayton, Oreg.

Application September 22, 1955, Serial No. 535,867

2 Claims. (Cl. 187-9) This invention relates to improvements in hoisting apparatus and more particularly to hoists of the material and article handling type.

It is one of the principal objects of the invention to provide a hoist adapted for portable or stationary use and made up of a base frame and any desired number of sectional frames vertically interconnected and superimposed upon the base frame to thereby render the hoist extensible to desired elevations.

A further object of this invention is the provision of a hoist characterized by means continuously operable through all the assembled frames to vertically reciprocate a load carrier or elevator'carriage.

A still further object is the provision of a hoist of this character which is of sturdy and durable construction, reliable and efficient in operation, and relatively simple and inexpensive to manufacture, assemble, and utilize.

The foregoing and other objects will appear as my invention is more fully hereinafter described in the following specification, illustrated in the accompanying drawings, and finally pointed out in the appended claims.

In the accompanying drawings:

Figure 1 is a side view of a sectional, portable hoist made in accordance with my invention and'with a fragment broken away for convenience of illustration.

Figure 2 is a fragmentary front view of Figure 1.

Figure 3 is an enlarged fragmentary side view of interconnected vertical sectional frames with parts broken away to reveal underlying parts.

Figure 4 is a sectional top plan view taken approximately along the line 4-4 of Figure 3.

Figure 5 is an enlarged sectional rear view taken. approximately along the line 5-5 of Figure 4.

Figure 6 is a sectional top plan view taken along the line 66 of Figure'S.

Figure 7 is a view similar to Figure 3 illustrating a modified form of the invention.

Figure 8 is a sectional view taken along the line 8-8 of Figure9. i 7

Figure 9 is a sectional top plan view taken along the line 99 of Figure 8.

Referring now more particularly to the drawings:

In Figures 1 and 2, reference numeral 1 indicates a platform mounted in any approved manner upon supporting wheels 2. One end of the platform is provided with any suitable type of tank 3 which may be filled With water to counterbalance the loads carried by the hoist.

The hoist proper comprises a base frame and any desired number of sectional frames superimposed upon one another and secured together and to the base frame in a vertical column. Secured as at 4 to the platform 1 is the bottom end of the base frame generally indicated at 5 which comprises a pair of vertical channel members 6 and 7 held in parallel spaced relation to each other by a cross member 8 interconnecting their top ends and reinforced by diagonal braces 9. The platform 1 carries a suitable electric motor 10 driving, through a suitable man ually controlled power transmission means 11, a drive shaft 12 which drives through a worm and worm gear a 13 and 13A, respectively, a shaft 14 extending transversely of the base frame and journaled in the'channel members 6 and 7 thereof. Multiple sprocket wheels 15 are secured to opposite ends of the shaft 14 and each group drives an endless multiple-width sprocket chain or roller chains 17 and 18 which extend vertically adjacent the webs of the upright channel members 6 and 7 and drive similar sprockets 19 and 20, respectively (see Fig-f journaled in ure 4) secured to opposite ends of a shaft 21 the channel members at the top ends thereof.

Secured to the web of each channel member by weld ing or the like and extending substantially throughout the length thereof is an angle iron 22 to provide a track for one side of a traveler block 23 whose opposite side is provided with a projection 24 slidable within a groove I 25 formed on the inside of the front "flange 26 of its respective channel member. To the blocks 23 is secured as at 27 a pair of arms 28 upon which may be mounted a platform 29 to provide an elevator carriage or load car-' rier. The top and bottom outside corners of each traveler block are provided with rollers 30 to reduce travel fric-' tion to a minimum and to prevent the blocks from binding under a load within their respective tracks 22 and 26.

tom ends of the channel members 6A and 7A of a superimposed sectional frame 5A are secured by lugs 36A and bolts 37. The sectional frame 5A is typical of any num-' ber of such frames which maybe joined together in a vertical column by lugs 40 at their upper ends secured to lugs 41 at the bottom ends of an adjoining frame by means of bolts 42. The bottom end of each sectional frame has a transverse shaft 43 journaled in the websof its channel members and secured to the shaft is a gear 44 meshing with and driven by a gear 45 which meshes with and is driven by a driving gear 46 secured to the shaft 21 at the top end of the base frame 5 and driven by the multiple sprocket chains 17 and 18 as aforesaid. The gear 45 is secured to a shaft 47 whose ends are journaled in bearings 48 secured as at 49 to the bottom end of the channel members 6A and 7A of the sectional frame 5A and extend slightly below the bottom edge thereof as shown.

From the foregoing it will be apparent that any number of sectional frames 5A may be secured together in" a column to any desired height and their respective sprocket chains progressively driven through the medium of their gears 44 and 45 being driven by the gear 46 at the top end of the immediate underlying frame section.

It will be noted in Figure 3 that the length of the traveler blocks 23 is greater than the distance between the centers of the shafts driving the sprockets at the top end of a lower section and the adjacent sprockets at the bottom end of an upper section so that the teeth 32 at the top end of the blocks will engage the chain of the upper frame section before the teeth at the bottom end of the blocks become disengaged from the sprocket chain at the upper end of the underlying frame section. The upward travel of the blocks is thus continuous from one section to the next. This, of course, applies to the lowering of the load carrier as well as to the lifting of the same. To prevent any inward tilting of either the top end or bottom end of the traveler block as it travels across the gap between the chains, I secure a pair of plates 50 and 51 Patented Oct. 21, 1958 which come into vertical alignment with each other when the frame sections are vertically joined together to serve as a continuation of the track 22 in each frame section.

In the'modified form of the inventionshown in Figure 7 the vertical channel member. 6B of the base frame 58 is identical with its companion channel member not shown. A shaft 55 is journaled as at 56 on the platform 1A at the base of each channel member. The outer ends of both shafts are operatively connected by any suitable coupling, (not shown) with the shaft 12 of the power transmission means 11 shown in Figure 1. The opposite end of each shaft is provided with a bevel gear 57 meshing with and driving a companion gear 58 secured to the bottom end of a vertical screw shaft 59 journaled in a thrust bearing 60 mounted upon a cross member 61 secured to theflanges of the vertical channel members. Thebottom and, top ends of the screw shaft 59 are rotatably held in bearing blocks 62 and' 63, respectively, secured to the flange 64 of the channel member and truncated as at 65 (see Figure 9) so as to embrace the screw shaft 59 only to the extent shown. One side of the traveler block 23A is partially threaded as at 66 to match the exposed threads on those portions of the screw shaft 59 embraced by the truncated bearing blocks so that the traveler block can pass the bearing blocks in its up and down travel in the channel member 6B as it is driven by the screw shaft 59. The opposite side of the traveler block, is provided with a projection 24A slidable within a groove 25A formed on the inside of the flange 67 of the channel member. The block is also provided with rollers 30A to prevent tilting and to reduce friction. An arm 28A is secured as at 27A to each traveler block to support a load platform 29A.

.The bottom end of a superimposed sectional frame SC is adapted, as at 68, for bolted attachment to the top end of the base frame 5B and is provided with a truncated bearing block, 62B to rotatably hold the bottom end of its respective screw shaft 59A which is similarly held at its top end by an identical bearing block not shown. The top end of each screw shaft 59 is provided with an axial socket 69 for. engagement with a squared projection 70 onthe bottom end of the screw shaft 59A of the superimposed sectional frame 5C.

It will be apparent, as in the first form of the invention, that any number of sectional frames 50 may be secured together and to the base frame 5B in a vertical column to any desired elevation and their interconnected respective'screw shafts simultaneously driven by the gears 58 and 57 attheir bottom ends to raise and lower the load carrier 29A throughout the height of the assembled frames without interruption.

While I have shown particular forms of embodiment of my invention I am aware that many minor changes therein will readily suggest themselves to others skilled in the art without departing from the spirit and scope of theinvention. Having thus described my invention what I claim as new and desire to protect by Letters Patent is: 1. A hoist of the character described comprising in combination a vertical base frame mounted upon a support, a plurality of sectional frames removably secured to each other and to said base frame in a vertical column, a pair of laterally spaced apart traveler blocks movable upwardly and downwardly as a unit within said frames, power driven means continuously operable through said frames and connected to said traveler blocks to vertically reciprocate a load carrier secured to the traveler blocks, said means comprising power driven sprocket wheels at the bottom end of said base frame operatively interconnected with sprocket wheels at the top end thereof, power transmission means operatively interconnecting said top sprocket Wheels with sprocket wheels at the bottom end of a sectional frame and operatively connected with sprocket wheels at the top end thereof.

2. A hoist of the character described comprising in combination a vertical base frame mounted upon a support, at least one sectional vertical frame removably secured to the top endof said base frame as a vertical continuation thereof, each of said frames comprising a pair of spaced apart vertical channel members interconnected in parallel relation to each other, one flange of each channel member in each frame having a groove formed therein throughout its length, a pair of laterally spaced apart traveler blocks movable upwardly and downwardly as a unit within said channel members, a pair of load carrying arms secured to said traveler blocks intermediate the ends thereof and extending outwardly therefrom, each of said traveler blocks being provided with and guided by a projection throughout its length slidable in the groove in the flange of its respective channel member, rollers carried by each of said traveler blocks and arranged on both sides of its said projection and in rolling contact with the flange of its respective channel member on both sides of its respective groove whereby said traveler blocks will be stabilized against tilting or binding while in operation, and power driven means continuously operable through said frames and connected to said traveler blocks to vertically reciprocate a load carrier secured to the traveler blocks, said means comprising power driven sprocket wheels at the bottom end of said base frame operatively interconnected with sprocket wheels at the top end thereof, power transmission means operatively interconnecting said top sprocket wheels with sprocket wheels at the bottom end of a sectional frame and operatively connected with sprocket wheels at the top end thereof.

References Cited in the file of this patent UNlT ED STATES PATENTS 158,976 Pfautz et a1 Jan. 19, 1875 394,781 Maurer Dec. 18, 1888 514,299 Ayers Feb. 6, 1894 1,381,552 Hescock June 14, 1921 1,973,136 Atkinson Sept. 11, 1934 2,465,796 Freeman Mar. 29, 19.49 2,504,885 Schreck Apr. 18, 1950 

